Digital duplex transmission system
US4220816A · kind A · utility
28Cited by
2References
9Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Jan 11, 1979 |
| Grant date | Sep 2, 1980 |
| Priority date | — |
| Expiry date | Jan 11, 1999 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH04L25/4925
- WIPO fieldDigital communication
- WIPO sectorElectrical engineering
Abstract
A digital duplex transmission system for use in a local area uses a modified dipulse code from the exchange terminal to the subscriber terminal and either a different modified dipulse code or a modified AMI (Alternate Mark Inversion) code in the other direction to achieve time separation of signals at each terminal. Incorporation of a hybrid separator in each terminal further improves the performance of the system.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.